AC and DC Capacitor Discharge Repair Tools Capacitor constant current discharge pen V1.0 adopts rectifier bridge input mode, which can be used to discharge capacitors below 680uf/450v without distinguishing between positive and negative electrodes. IN1 and IN2 are the input terminals of the probe, pass through the BD1 rectifier bridge (adapted to AC and DC), and then transmit to the constant current circuit for continuous current discharge. Q1 is a small electronic load power tube, so the discharge current is constant, and there will be no ignition due to high voltage. High-voltage MOS tube design, the highest voltage can reach 540Vdc, to meet daily needs; special can be replaced with higher voltage MOS. A professional plum blossom test probe is used, convenient for testing, and not easy to scratch. It adopts transparent heat-shrinkable tube insulation and an anti-static package, the discharge is indicated by green LED, and the discharge time is less than 4 seconds. It is a practical tool for the discharge maintenance of miner electronic components.